﻿<template>
	<el-breadcrumb class="app-breadcrumb" separator="/">
		<transition-group name="breadcrumb">
			<el-breadcrumb-item v-for="(item,index) in levelList" :key="item.path">
				<span v-if="item.redirect==='noRedirect'||index==levelList.length-1" class="no-redirect">{{ item.meta.title }}<i v-if="index===0" class="el-icon-caret-right"></i></span>
				<a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}<i v-if="index===0" class="el-icon-caret-right"></i></a>
			</el-breadcrumb-item>
		</transition-group>
	</el-breadcrumb>
</template>

<script>

	import pathToRegexp from "/vue/libs/path-to-regexp.js";

	module.exports = {
		data() {
			return {
				levelList: null,
				hasSystemPage: hasSystemPage
			}
		},		
		computed: {
			guideTitle() {
				return this.hasSystemPage ? "系统主页" : "访问路径";
			}
		},
		watch: {
			$route(route) {
				// if you go to the redirect page, do not update the breadcrumbs
				if (route.path.startsWith('/redirect/')) {
					return
				}
				this.getBreadcrumb()
			}
		},
		created() {
			this.getBreadcrumb()
		},
		methods: {
			getBreadcrumb() {
				// only show routes with meta.title
				let matched = this.$route.matched.filter(item => item.meta && item.meta.title)
				const first = matched[0]

				if (!this.hasSystemPage) {
					matched = [{ path: '/hello', redirect: 'noRedirect', meta: { title: this.guideTitle } }].concat(matched)
				}
				else if (!this.isDashboard(first)) {
					matched = [{ path: '/dashboard', meta: { title: this.guideTitle } }].concat(matched)
				}
				else {
					first.meta.title = this.guideTitle;
				}

				this.levelList = matched.filter(item => item.meta && item.meta.title && item.meta.breadcrumb !== false)
			},
			isDashboard(route) {
				const name = route && route.name
				if (!name) {
					return false
				}
				return name.trim().toLocaleLowerCase() === 'Dashboard'.toLocaleLowerCase()
			},
			pathCompile(path) {
				// To solve this problem https://github.com/PanJiaChen/vue-element-admin/issues/561
				const { params } = this.$route
				var toPath = pathToRegexp.compile(path)
				return toPath(params)
			},
			handleLink(item) {
				const { redirect, path } = item
				if (redirect) {
					this.$router.push(redirect)
					return
				}
				this.$router.push(this.pathCompile(path))
			}
		}
	}
</script>

<style scoped>
	.app-breadcrumb.el-breadcrumb {
		display: inline-block;
		font-size: 14px;
		line-height: 50px;
		margin-left: 8px;
	}

		.app-breadcrumb.el-breadcrumb .no-redirect {
			color: #97a8be;
			cursor: text;
		}

</style>
